300L Indirect Telford Tempest Vertical Unvented Cylinder TSMI300

300L Indirect Telford Tempest Vertical Unvented Cylinder – TSMI300

The 300L Telford Tempest TSMI300 is the largest indirect vertical unvented cylinder in the Tempest range, designed for large family homes with up to 6 bedrooms, multiple bathrooms and high daily hot water demand.

Perfect for properties where several showers, baths and hot water outlets may be used simultaneously, the TSMI300 delivers reliable mains pressure hot water without compromising performance. Manufactured from 2304 Duplex Stainless Steel, it offers exceptional corrosion resistance, outstanding durability and fast hot water recovery when connected to a traditional boiler. The integrated 3kW immersion heater also provides convenient backup hot water whenever required.

Supplied complete with the expansion vessel and installation kit, the TSMI300 includes everything required for a professional installation.

Key Features

• 300 litre indirect vertical unvented cylinder
• Ideal for large homes with up to 6 bedrooms and multiple bathrooms
• Largest indirect model in the Telford Tempest range
• Manufactured from 2304 Duplex Stainless Steel
• Excellent corrosion resistance for a longer service life
• 3 Bar working pressure
• Pressure tested to 15 Bar
• Relief valve operates at 7 Bar / 90–95°C
• 22mm domestic and primary connections
• Delivers up to 55 litres per minute flow rate
• Fast hot water recovery
• Suitable for mains pressure hot water systems
• Complete with expansion vessel and installation kit
• Lifetime cylinder warranty*

Supplied Complete With

• Expansion Vessel
• Expansion Vessel Kit
• Dual High Limit Thermostat
• 3kW Immersion Heater (240V Single Phase)
• Temperature & Pressure Relief Valve
• 3 Bar Inlet Control Group
• Two Port Motorised Valve

Everything required for a standard installation is included.

Why Buy From TDL?

• Kept in stock for immediate dispatch
• FREE Next Working Day Delivery when ordered before 2:30pm
• Competitive UK prices
• Expert technical support from our experienced team
• Real People. Real Service. For Over 40 Years.

Recommended Cylinder Size Guide

The above guide is intended as a recommendation only. Actual hot water requirements will vary depending on household usage.